Rally dash redo

Ok in 68 white wire to "D" b/h cavity leads to backup lamp switch(a/t). Not to confuse but violet at "C" also leads to backup switch.
For 67 the b/u switch has me confused....18 ga white and a 18 ga violet. Hard to tell if white comes from bulkhead (H cavity) or if white is from Wiper switch??:wtf:
18 ga violet leads to #4 cavity "to body wiring"> to b/u lights.
Wheres the dynamite emoji? Lol